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Fig. 4.31 The results of
field experiments during Vietnamese/Russian hydrophysical expedition
of 1994 when the oil pollution of the Sai Gon and Dong Nai rivers is studied by means of Adaptive
Identi
er. The results of the measurements are marked by the symbols
“•”
and
«
o
»
for the Saigon
river and by the symbols
“
+
”
and
“”
for Dong Nai River at 14 and 15 November, respectively. The
scale step is 0.05 mg L
-1
during 1 day. It is clear that including in the monitoring system functions for the
control of Saigon river pollution demands additional information about the
dynamics of the rise and fall of the tides. This information has to be parameterized
and stored in the monitoring system knowledge base, or come from the measuring
subsystem.
At present, the Dong Nai River has a low pollution level. Measurements data
received by Adaptive Identi
er shows a high stability of oil pollution distribution in
this river. Therefore, the realization of the monitoring system function to control oil
pollution of the Dong Nai River can be considered as a future stage.
Finally, Fig.
4.31
represents hourly dynamics of the oil pollution level for both
rivers. The measurements by Adaptive Identi
er are realized for the Saigon River at
its middle in the HoChiMinh city center and for the Dong Nai River in the drinking
water station at the distance of 30 m from the waterfront. Comparison of the curves
of Fig.
4.31
shows that control of the oil pollution near this station should be
realized by means of Adaptive Identi
er in the continuous regime and has the
possibility to control the water standard. It is more dif
cult to control the water
standard in the Saigon River, where hourly variations of the pollution level oscillate
between the limits of 100
300 %. Such oscillations are caused by complex
hydrodynamic conditions of the spreading of the pollutants. A combination of high
current velocity, rise and fall of the tides and high turbulence causes the formation
of pollutant clots which move as closed water volumes.
-
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